Why does GarageBand automatically select all regions on a track?

When working in GarageBand, I noticed that often, all regions of a track will get automatically selected. This occurs when changing tracks by selecting them in the gray arrangement area on the left. For instance, going from your bass track to guitar. More often than not though, this just sets up inadvertent deletions. Last night, I lost some really good lead takes this way and didn't even notice because I was zoomed up on another area of the song. Unless the automatic one-click "all regions" selection has some kind useful purpose, I feel this feature should be removed, modified, or made a preference option since it seems to cause more problems than be useful.